Thermal recovery packer

Abstract

The application relates to a thermal recovery packer and relates to the technical field of oilfield downhole tools. A center pipe is sequentially sleeved with a heat insulation rubber sleeve, a spacer sleeve, a sealing rubber sleeve and a cooling sleeve between an upper joint and an upper top ring. The cooling sleeve comprises an annular cavity, and the cooling sleeve extends outwards from the cavity to form a plurality of cooling discs. The application has the beneficial effects that the heat insulation rubber sleeve is arranged at the lower side of the sealing rubber sleeve, the temperature of the part where the sealing rubber sleeve is located is relatively low, the sealing rubber sleeve can be sealed for a long time, the heat of injection and production steam is not lost, and the cost of steam injection and production is reduced; the capsule and the cooling sleeve are arranged in the heat insulation rubber sleeve, thereby forming a cooling system, the oil in the capsule flows upwards after being heated by the injection and production steam, the hot oil is cooled by the cooling discs at the upper side of the sealing rubber sleeve, the cooled oil flows downwards from the oil outlet pipe to the lower part of the capsule, thereby cooling the heat insulation capsule, and the service life of the heat insulation rubber sleeve is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield downhole tools, and particularly relates to a thermal recovery packer. BACKGROUND

[0002] The thermal recovery packer is a common and key downhole tool in heavy oil exploitation, which is used for steam injection well sealing and separate layer steam injection, etc. The thermal recovery packer needs to withstand high temperature and high pressure, and has high performance requirements. After each steam injection, the well needs to be closed for a period of time to reduce the viscosity of the heavy oil, and then the heavy oil is exploited. Due to the high temperature of the injected steam, which is as high as 260 DEG C, the rubber tube of the packer ages, and leakage occurs between the rubber tube and the casing, resulting in heat loss. The leakage will continuously expand over time, and eventually leads to the failure of the packer. SUMMARY

[0003] In order to solve the problems of low service life and large heat loss of the existing thermal recovery packer, the present application provides a thermal recovery packer.

[0004] The technical scheme provided by the present application is as follows: a thermal recovery packer, comprising an upper joint and a lower joint, the lower part of the upper joint is connected with a central pipe through a sealing ring and a thread, the lower part of the central pipe is connected with the lower joint through a sealing ring and a thread, the outer circle of the lower joint is connected with a deblocking pipe through a sealing ring and a deblocking pin, the deblocking pipe is internally provided with a piston, the piston is matched with the deblocking pipe and the central pipe through a sealing ring, the central pipe is provided with a liquid inlet hole below the sealing ring of the piston, the upper part of the piston is provided with a lower top ring, the central pipe is sequentially sleeved with a heat insulation rubber tube, a spacer, a sealing rubber tube and a cooling sleeve between the upper joint and the lower top ring, the cooling sleeve comprises an annular cavity, the cooling sleeve extends outwards from the cavity to form a plurality of cooling discs, the lower side of the cooling sleeve is provided with an upper top ring, the upper top ring is pressed on the upper side of the sealing rubber tube, the cooling sleeve is internally provided with an oil outlet pipe and an oil inlet pipe, the top of the oil outlet pipe is flush with the bottom of the cavity, the oil inlet pipe extends into the upper part of the cavity, and the oil inlet pipe and the oil outlet pipe pass through the sealing rubber tube and the spacer downwards.

[0005] The heat insulation rubber tube has a hollow structure, and a capsule is installed in the heat insulation rubber tube, a socket pipe is fixedly connected to the capsule through vulcanization, the socket pipe extends out of the capsule upwards, the number of the socket pipes is six and is uniformly distributed in a circle, the number of the oil inlet pipe and the oil outlet pipe is three, the socket pipes are respectively inserted into the oil inlet pipe and the oil outlet pipe through sealing rings, a soft pipe extends downwards from the lower part of the socket pipe which is inserted into the oil outlet pipe, the soft pipe extends into the lower part of the capsule, and the capsule, the oil inlet pipe, the oil outlet pipe and the cavity are filled with heat conducting oil.

[0006] A one-way tooth ring is processed on the upper part of the outer circle of the piston, a tool withdrawal groove is arranged at the bottom of the one-way tooth ring, a one-way tooth hole is processed on the upper part of the inner hole of the deblocking pipe, and the one-way tooth hole and the one-way tooth ring are matched to enable the piston to ascend along the deblocking pipe but not to descend.

[0007] The heat-insulating rubber sleeve consists of an upper body and a lower body. The inner hole of the lower body is machined into an inner serrated step, and the outer circle of the upper body is machined into an outer serrated step. The inner serrated step covers the outer side of the outer serrated step.

[0008] The beneficial effects of the present invention are as follows: by setting a heat-insulating rubber tube on the lower side of the sealing rubber tube, the temperature of the part where the sealing rubber tube is located is low, which can seal for a long time, so that the heat of the injection steam is not lost, and the cost of steam injection is reduced.

[0009] A capsule is installed inside the heat-insulating rubber sleeve, and a cooling jacket is installed on the upper side of the sealed rubber sleeve. The cavity of the cooling jacket is equipped with an oil inlet pipe and an oil outlet pipe, which are connected to the capsule. The oil inlet pipe is located at the upper part of the cavity, and the hose is located at the bottom of the capsule, thus forming a cooling system. The oil inside the capsule is heated by the injection steam and flows upward. The hot oil is cooled by the cooling plate on the upper side of the sealed rubber sleeve, and the cooled oil flows back down to the lower part of the capsule from the oil outlet pipe, thereby cooling the heat-insulating rubber sleeve and extending its service life.

[0010] The separate insulated rubber sleeve facilitates the installation of the capsule. At the same time, the lower half of the body suffers severe aging due to heat during steam injection and can be replaced separately, reducing operating costs. Attached Figure Description

[0011] Appendix Figure 1 This is a three-dimensional diagram of the present invention;

[0012] Appendix Figure 2 This is a schematic diagram of the structure of the present invention;

[0013] Appendix Figure 3 It is attached Figure 2 Enlarged view of point A;

[0014] Appendix Figure 4 It is attached Figure 2 Enlarged view of point B;

[0015] Appendix Figure 5 This is a schematic diagram of the cooling jacket of the present invention;

[0016] Appendix Figure 6 This is a schematic diagram of the structure of the heat-insulating rubber tube in this invention;

[0017] Appendix Figure 7 This is a schematic diagram of the structure of the present invention after sealing;

[0018] Appendix Figure 8 It is attached Figure 7 Enlarged view of point C;

[0019] Appendix Figure 9 This is a schematic diagram of the cooling system of the present invention.

[0020] In the diagram: 1-Upper connector, 2-Lower connector, 3-Central tube, 301-Liquid inlet, 4-Sealing sleeve, 5-Insulating sleeve, 501-Lower body, 5011-Inner serrated step, 502-Upper body, 5021-Outer serrated step, 6-Piston, 601-One-way toothed ring, 602-Lower top ring, 603-Relief groove, 7-Unsealing tube, 701-One-way toothed hole, 8-Unsealing pin, 9-Capsule, 901-Hose, 902-Socket tube, 10-Spacer sleeve, 11-Cooling jacket, 1101-Cavity, 1102-Cooling plate, 1103-Upper top ring, 1104-Oil inlet pipe, 1105-Oil outlet pipe. Detailed Implementation

[0021] like Figures 1-9 As shown, a thermal recovery packer includes an upper connector 1 and a lower connector 2. The lower part of the upper connector 1 is connected to a central tube 3 via a sealing ring and threads. The lower part of the central tube 3 is connected to the lower connector 2 via a sealing ring and threads. The outer circumference of the lower connector 2 is connected to a release tube 7 via a sealing ring and a release pin 8. A piston 6 is provided inside the release tube 7. The piston 6 is in clearance fit with the release tube 7 and the central tube 3 via a sealing ring. The central tube 3 has a liquid inlet hole 301 below the sealing ring of the piston 6. A lower top ring 602 is provided on the upper part of the piston 6. The central tube 3 is fitted with a heat insulation sleeve 5 and a spacer 1 in sequence between the lower top ring 602 and the upper connector 1. 0. Sealing sleeve 4 and cooling jacket 11. Cooling jacket 11 includes an annular cavity 1101. Several cooling plates 1102 extend from the outside of the cavity 1101. A top ring 1103 is provided on the lower side of the cooling jacket 11. The top ring 1103 presses against the upper side of the sealing sleeve 4. The cooling jacket 11 has an oil outlet pipe 1105 and an oil inlet pipe 1104 in the cavity 1101. The top of the oil outlet pipe 1105 is flush with the bottom of the cavity 1101. The oil inlet pipe 1104 extends into the upper part of the cavity 1101. The oil inlet pipe 1104 and the oil outlet pipe 1105 pass downward through the sealing sleeve 4 and the spacer 10.

[0022] The heat-insulating rubber sleeve 5 has a hollow structure. A capsule 9 is installed inside the heat-insulating rubber sleeve 5. A socket tube 902 is fixedly connected to the capsule 9 by vulcanization. The socket tube 902 extends upward from the capsule 9. There are six socket tubes 902 evenly distributed around the circumference. There are three oil inlet pipes 1104 and three oil outlet pipes 1105. The socket tubes 902 are respectively inserted into the oil inlet pipe 1104 and the oil outlet pipe 1105 through sealing rings. A section of flexible hose 901 extends downward from the lower part of the socket tube 902 inserted into the oil outlet pipe 1105 of the capsule 9. The flexible hose 901 extends into the lower part of the capsule 9. The capsule 9, the oil inlet pipe 1104, the oil outlet pipe 1105 and the cavity 1101 are filled with heat-conducting oil.

[0023] The outer circle of the piston 6 is processed with a one-way tooth ring 601, the bottom of the one-way tooth ring 601 is provided with a tool withdrawal groove 603, the inner hole of the unblocking pipe 7 is processed with a one-way tooth hole 701, the one-way tooth hole 701 cooperates with the one-way tooth ring 601, so that the piston 6 can ascend along the unblocking pipe 7 and cannot descend.

[0024] When the packer is lowered into the casing and the steam injection is started, the steam pressure enters the position of the piston 6 through the liquid inlet hole 301, pushes the piston 6 to ascend, and pushes the heat insulation rubber sleeve 5 and the sealing rubber sleeve 4 to expand outward, since the piston 6 is connected with the unblocking pipe 7 through the one-way tooth ring 601, the piston 6 can only ascend and cannot descend, so that the sealing rubber sleeve 4 and the heat insulation rubber sleeve 5 are set in the casing;

[0025] When the piston 6 is set, the one-way tooth hole 701 of the unblocking pipe 7 is pressed at the position of the tool withdrawal groove 603 of the piston 6, the unblocking pipe 7 is fixedly connected with the piston 6 in the axial direction, when unblocking, the pipe string is pressed downward, the unblocking pin 8 is broken, the axial constraint of the unblocking pipe 7 is removed, and the unblocking pipe 7 and the piston 6 can descend, so that the movable pipe string can be unblocked.

[0026] The heat insulation rubber sleeve 5 is arranged below the sealing rubber sleeve 4, so that the temperature of the position where the sealing rubber sleeve 4 is located is low, the sealing rubber sleeve 4 can be sealed for a long time, the heat of the steam injection and production is not lost, and the cost of the steam injection and production is reduced;

[0027] The capsule 9 is arranged in the heat insulation rubber sleeve 5, the cooling jacket 11 is arranged on the upper side of the sealing rubber sleeve 4, the cavity 1101 of the cooling jacket 11 is provided with the oil inlet pipe 1104 and the oil outlet pipe 1105, the oil inlet pipe 1104 and the oil outlet pipe 1105 communicate with the capsule 9, the oil inlet pipe 1104 is arranged at the upper part of the cavity 1101, and the hose 901 is arranged at the bottom of the capsule 9, so that a cooling system is formed, the oil in the capsule 9 flows upward after being heated by the steam injection and production, the hot oil is cooled on the cooling disc 1102 on the upper side of the sealing rubber sleeve 4, and the cooled oil flows downward to the lower part of the capsule 9 from the oil outlet pipe 1105, so that the heat insulation rubber sleeve 5 is cooled, and the service life of the heat insulation rubber sleeve 5 is prolonged.

[0028] The heat insulation rubber sleeve 5 is composed of the upper half body 502 and the lower half body 501, the inner hole of the lower half body 501 is processed into an inner sawtooth step 5011, and the outer circle of the upper half body 502 is processed into an outer sawtooth step 5021; the inner sawtooth step 5011 is covered outside the outer sawtooth step 5021, the beneficial effect of the split heat insulation rubber sleeve 5 is that the capsule 9 is convenient to install, meanwhile, the lower half body 501 is seriously aged by the steam injection and production, the lower half body 501 can be replaced alone, and the operation cost is reduced.

Claims

1. A thermal production packer comprising an upper joint (1) and a lower joint (2), characterized in that: The upper joint (1) is connected with the central pipe (3) through a sealing ring and a threaded connection, the lower part of the central pipe (3) is connected with the lower joint (2) through a sealing ring and a threaded connection, the outer circle of the lower joint (2) is connected with the unsealing pipe (7) through a sealing ring and an unsealing pin (8), the unsealing pipe (7) is provided with a piston (6) inside, the piston (6) is matched with the unsealing pipe (7) and the central pipe (3) through a sealing ring, the central pipe (3) is provided with a liquid inlet hole (301) below the sealing ring of the piston (6), the upper part of the piston (6) is provided with a lower top ring (602), the central pipe (3) is sequentially sleeved with a heat insulation rubber sleeve (5), a spacer sleeve (10), a sealing rubber sleeve (4) and a cooling sleeve (11) between the lower top ring (602) and the upper joint (1), the cooling sleeve (11) comprises an annular cavity (1101), the cooling sleeve (11) extends out a plurality of cooling discs (1102) outside the cavity (1101), the lower side of the cooling sleeve (11) is provided with an upper top ring (1103), the upper top ring (1103) is pressed on the upper side of the sealing rubber sleeve (4), the cooling sleeve (11) is provided with an oil outlet pipe (1105) and an oil inlet pipe (1104) in the cavity (1101), the top of the oil outlet pipe (1105) is flush with the bottom of the cavity (1101), the oil inlet pipe (1104) extends into the upper part of the cavity (1101), the oil inlet pipe (1104) and the oil outlet pipe (1105) pass through the sealing rubber sleeve (4) and the spacer sleeve (10) downwardly. The heat insulation rubber sleeve (5) is a hollow structure, the heat insulation rubber sleeve (5) is provided with capsules (9) inside, the capsules (9) are fixedly connected with socket pipes (902) through vulcanization, the socket pipes (902) extend out of the capsules (9) upwardly, the number of the socket pipes (902) is six and is uniformly distributed in a circle, the number of the oil inlet pipe (1104) and the oil outlet pipe (1105) is three, the socket pipes (902) are respectively inserted into the oil inlet pipe (1104) and the oil outlet pipe (1105) through sealing rings, the capsules (9) are provided with a soft pipe (901) extending downwardly below the socket pipes (902) inserted into the oil outlet pipe (1105), the soft pipe (901) extends into the lower part of the capsule (9), the capsules (9), the oil inlet pipe (1104), the oil outlet pipe (1105) and the cavity (1101) are filled with heat conducting oil.

2. The thermal recovery packer of claim 1, wherein: The outer circle of the piston (6) is processed with a one-way tooth ring (601) in the upper part, the bottom of the one-way tooth ring (601) is provided with a tool withdrawal groove (603), the inner hole of the unsealing pipe (7) is processed with a one-way tooth hole (701) in the upper part, the one-way tooth hole (701) is matched with the one-way tooth ring (601) to enable the piston (6) to ascend along the unsealing pipe (7) but not to descend.

3. The thermal recovery packer of claim 1, wherein: The heat insulation rubber sleeve (5) is composed of an upper half body (502) and a lower half body (501), the inner hole of the lower half body (501) is processed into an inner sawtooth step (5011), the outer circle of the upper half body (502) is processed into an outer sawtooth step (5021), the inner sawtooth step (5011) is covered outside the outer sawtooth step (5021).

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